097-72020-01 Revision K – December 2005 TimeSource 3100 User’s Guide 27
Chapter 1 Overview of the TimeSource 3100
Functional Description
The user can set the parameters for SEVERITY1 and SERAFF1 which initially
come into effect when the condition is detected. The user can also set the
parameters for SEVERITY2 and SERAFF2 which come into effect after TIME
(another user programmable parameter).
Startup
When the TimeSource starts up, the CRIT lamp lights. The CRIT lamp remains on
for approximately 50 seconds to 60 seconds and then shuts off.
During startup, the TimeSource performs several self-tests to verify the integrity of
the hardware and software. Neither communication nor outputs are possible at this
time, and the CRIT lamp is switched on. Once the self-tests are done, a connection
to the system can be made and the events viewed.
Two events are initially provided. These events are:
“Power Up Restart”
“Settling Period”
In the “Power Up Restart” event, which lasts for approximately 2 minutes, the
system does additional checks and starts all the various tasks within the system.
The “Settling Period” event is an informational message that lasts until the
TimeSource’s BesTime engine reaches the highest possible stable point. The time
taken to reach this point depends on satellite availability, type of oscillator, ambient
temperature, etc. and may take up to 20 hours to clear. Since “Settling Period” is
independent of the quality of the output and is the normal behavior of the system, it
is generated as an event rather than an alarm. If “Settling Period” is not cleared
after 24 hours, another “Settling Period” event is generated as a marker. This is still
Non-Service-Affecting.
As soon as the “Power Up Restart” message is cleared, the “BT3 Warm-up” event is
generated. This is also an informational message that lasts till the time it takes the
system to acquire the satellites, warm up the oscillator, and start giving out valid
outputs. It may take up to 2 hours for the message to clear, but typically takes
approximately 40 minutes. During the “BT3 Warm-up” time, the outputs will
generally be squelched. If the outputs are enabled using the TL1 command
(ED-EQPT::TS3100:ctag:::ALMCOND=ALW;) they may not be within the PRS
mask. In case the system is not able to acquire sufficient number of satellites and/or
discipline the oscillator within 2 hours, the event escalates into a Non Service
Affecting Minor alarm.
Once the warm up is complete, the system generates valid outputs and the event is
cleared.
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